新型切边、冲孔复合模具

模锻件的切边、冲孔在我厂是一劳动强度大、直接影响锻件质量的工序。在提高产品质量,讲究经济效益的活动中,我们利用315吨压力机本身带有顶出机构的有利条件,设计、制造了一套新型的切边、冲孔复合模,使锻件自动地从凹模中顶出,实现了机械化操作,减轻了劳动强度,节约了人力,切边、冲孔质量100%合格,使用效果良好。     

重型汽车钢板弹簧切边模改进设计

汽车钢板弹簧是各种载重汽车、机车上的重要零部件,一般在冲击、振动或长期均匀的周期改变应力的环境下工作。本文针对传统重型汽车钢板弹簧切边模存在的不足,在分析板簧切边工艺的基础上,提出了改进措施,给出了模具的总体结构,并对其主要零部件作了设计说明,最后对所设计的模具进行了试模。试模结果表明,该模具可提高钢板弹簧切边精度,模具自身寿命也得到大幅提高。     

机械工人职业技能鉴定专栏——高级工模锻技能

考核图样技术要求〕攀甸‘卫~七门’操口〔!)l圃’碑瞥型40RR.石p 报8科份~去曰弘,‘{反初(斗、或弓石盆附 考核内容 1.安装、调整锻模:①以检验面为墓准安装、调整锻模;②上、下燕尾贴合良好;③键块、楔铁紧固 2.安装调整切边模:①安装、调整好凸模、凹模;②各处紧固良好 3.锻件质量:①锻件高度公差;②锻件错差;③锻件表面缺陷;④锻件氧化皮深度 4.测温:①目测始锻温度误差不超过士30℃;②目测终锻温度误差不超过一30℃ 5.模具使用与维护:①模具预热150一250℃;②合理润滑冷却;③随时清除模膛和分模面上的氧化皮 6.切边质量:不得啃伤、压…     

切边,冲孔连续模在锻造生产中的应用

图1所示零件为拖拉机履带节,它是拖拉机上零件数量最多的一种,生产批量较大。原先锻造工艺是:锻造后进行切边、冲孔。冲孔前需进行第二次加热,因而增加了锻件的氧化皮,使锻件质量降低,成本提高。为此,我们改进了模具,将切边、冲孔两道工序用一副连续模完成。经生产证明,提高了锻件质量和生产效率,降低了成本。     

半轴齿轮新工艺及新型模具设计

针对汽车差速器半轴齿轮原挤压模具结构存在的问题,改进了挤压工艺,设计了新型预成型挤压模和精压模.工艺试验表明,新工艺可显著降低挤压变形力、材料消耗和生产成本,提高模具寿命和生产效率.     

铝轮辋锻压成形工艺优化及模具设计

为了提高锻件材料利用率,降低锻压成形压力,根据铝轮辋锻件形状特点,优化锻压成形工艺。采用铸造空心圆环坯在芯棒式锻压成形模中进行闭式模锻,将预锻、终锻、切边与冲孔四道工序合为一,无需预锻、切边与冲孔,提高了生产效率与材料利用率;无需大吨位锻压设备,便可保证锻件厚度尺寸。经实践验证,该模具结构简单合理,锻压成形稳定可靠,具有较高的实用价值。     

乙形保持架切边模的改进

改进设计后的乙形保持架切边模具,克服原模具间隙调整困难,易啃模的缺点,且结构简单,操作方便,定位精确,生产效率提高.附图4幅.     

凸缘锻件冲孔连皮位置的确定方法

锻件分模面位置的选择,在很大程度上影响着模具的寿命和锻件的质量。我们生产的一种凸缘产品就曾因分模面的选择不合理而造成大量的废品和模具的提前报废。后经我们改进设计,消除了原有的缺点。     

精铸切边模试制成功

长春第一汽车厂锻造分厂使用的切边模具,批量大,品种多,工艺流程长。尤其是手工堆焊和风砂轮手工修形等工序,效率低,劳动强度大。 75年8月份,他们发扬敢想敢干的革命精神,利用精密铸造的方法,制成了三套新材料的 Q43-10092十字轴切边模。经试切,比原模具寿命提高两倍多。在此基础上,他们又重新调整材料的成份,精铸了一套十字轴切边模,此模共切84850件。试验证明,用新材料精铸的切边模不仅寿命高,而且周期短,适于大批量生产。精铸模具,由于直接成形,表面光洁度达 4～ 6,尺寸精度达7～9级。 最近,又用三种不同材料,精铸成半轴齿轮等7种零件的…     

模锻件内外复合切边

我厂生产150C输送机中部槽锻件连接耳(见图1),材料A3钢,每台400余件,外加配件批量较大。1吨模锻锤成型后,内外切边工作量大。我们用内外切边模在160吨冲床上切边,效率较高。模具结构(图2)及切边过程如下: 该件内孔尺寸较小,如果内外毛边分别切除,内冲头细长刚性差,易崩裂、折断,操作也不便。故采用内外复合切边模解决上述问题。内冲头用螺纹固定在外冲头上,这就减短了内冲     

提高M16六角切边模使用寿命的有效途径

通过模具受力分析、材料优化等措施，显著提高了M16六角切边模的使用寿命。用LD、GM和W6M05Cr4V2CoS钢制作的生产M16碳钢和不锈钢螺栓用的模具，其使用寿命分别与SKH51、SKH55钢制造的同类进口模具水平相当，而价格却明显降低。     

一种空间曲线刃球头铣刀的设计

介绍了一种新型空间曲线刃球头铣刀的刃形特征和切削优点,详细分析了其空间几何参数的计算方法,简要说明了其制造工艺。     

线切割加工对冲模寿命影响的探讨

对线切割加工后模具表面的应力状态、消除措施、提高质量水平和使用寿命的各种方法作了初步探讨,并通过实例比较了不同方法的应用效果,指出了最佳方法是"喷丸+低温回火".     

改进高速钢刀具结构提高内孔表面车削质量

介绍了薄壁孔加工容易出现的集中问题,通过改进高速钢镗孔刀结构中几何角度和刀具参数、选择适宜的切削用量、合适的切削液、提高工艺的统一性,使薄壁孔的加工质量明显提高,加工后的工件符合设计要求,加工效率显著提高。     

Avoiding neural network fine tuning by using ensemble learning: application to ball-end milling operations

Surface roughness plays a key role in the performance of machined components??specially dies and moulds??manufactured for the aerospace and automotive industries, among others. However, roughness can only be measured off-line after the part has been machined, when cutting conditions may no longer be adjusted to surface roughness requirements. A reliable surface roughness prediction application is presented in this paper. It is based on ensemble learning for vertical high-speed milling operations with ball-end mills for finishing operations on quenched steel 1.2344 (AISI H13) that are widely used in the manufacture of moulds and dies. The new approach was validated with an experimental dataset that includes geometrical tool factors, cutting conditions, dynamic factors and lubricant type. An intensive comparison with an artificial neural network approach for the same dataset is included, to reveal the improvements of the new technique over other well-established ones for this industrial problem. This comparison shows that ensemble learning can by-pass the time-consuming task of tuning neural network parameters and can also improve prediction model accuracy, both of which are features that could lead to greater use of these kinds of prediction models in real workshops. Finally, a methodology, based on this new approach, is presented, in order to illustrate how the prediction model can be used in workshops to optimize cutting conditions in terms of their surface quality and productivity.     

CFRP与钛合金叠层制孔钻头横刃结构优化

针对碳纤维复合材料(CFRP)与钛合金夹层结构制孔过程中加工质量、制孔效率与钻头寿命低等问题,以钻头的横刃结构为主要研究对象设计试验方案,对钻头横刃结构进行优化,以提高加工质量、制孔效率与钻头寿命。结果表明:优化后的横刃结构加工性能优于普通"X"形钻头横刃结构,不论是碳纤维复合材料部位还是钛合金部位轴向切削力明显减小。     

A quality control method by ultrasonic vibration energy and diagnosis system at trimming process

In this paper, the characteristics in mechanical properties of ultrasonic cold forging treatment (UCFT) used for the trimming knife and the effects of ultrasonic vibration energy (UVE) into the trimming process on the state of the strip cutting face were studied. And a diagnosis system to quality control for trimming knife and strip cutting face was developed and installed in plant. By the plant application of UCFT, service life of knife was more increased over 100% than that of conventional knife and using the developed diagnosis system, the knife breakage and saw ear have been perfectly detected and quality control of trimming face is effectively obtained.     

Development of diagnosis system for knife and strip cutting face in the side trimming process

It is very important to measure and diagnose the state of knife and strip cutting face in real time in the side trimming process due to improvement of quality of strip trimming face. In this study, a diagnosis system for knife and strip cutting face was developed. Two CCD cameras facing each other are mounted at the delivery side (the entry of the bur masher roll) of the side trimmer. This system offers the operator the diagnosis result of state of knife and strip cutting face. With the help of the developed system, the knife breakage has been detected 100% and bad quality of trimming face is significantly decreased. Using CCD cameras, an on-line diagnosis system which can determine knife breakage and bad quality of trimming face in real time is developed in trimming. A diagnosis algorithm determining the state of the strip cutting face is also developed by calculating characteristic values and image processing based on the images of the strip cutting face obtained from CCD camera.     

几种麻花钻刃型试验

随着汽车工业的发展和新材料、新工艺、新设备的不断采用,对钻削加工提出了更高的要求。本文介绍了长春第一汽车制造厂对七种不同麻花钻刃型在切削力、断屑状况和刀具寿命等方面与标准钻头进行对比试验的情况。试验证明,新的钻头刃型在大批量汽车生产中使用效果很好。     

Effects of cutting edge radius and fiber cutting angle on the cutting-induced surface damage in machining of unidirectional CFRP composite laminates

Carbon fiber reinforced polymer composite laminates are anisotropic, inhomogeneous, and mostly prepared in laminate form before undergoing the finishing operations. The edge trimming process is considered as one of the most common finishing operations in the industrial applications. However, the laminate surface is especially prone to damage in the chip formation process, and the most common damage mode is burrs. Burrs may increase cost and production time because of additional machining; they can also damage the surface integrity. Many studies have been done to address this problem, and techniques for reducing burr size in material removal process has been the focus of the research. Nonetheless, the combined effects of the cutting edge radius and the fiber cutting angle on the burr formation have seldom been conducted, which in turn restricts to find out the mechanism of burr formation. The purpose of the present paper is to study the particular mechanism that leads to burr formation in edge trimming of CFRP laminates and investigate the effects of fiber cutting angle and cutting edge radius on burr formation. The results indicate that the burrs are prone to form in the fiber cutting angle range of 0° < χ < 90° when a large cutting edge radius of the tool is used for both milling and drilling of CFRP composites.